| By Your Side (BYS) Employment Centre Limited | Private company limited by shares | Live |
| Bysco Technology Limited | Private company limited by shares | Live |
| BYSE CO., LIMITED | Private company limited by shares | Live |
| HONG KONG BYSEA ELECTRONICS CO., LIMITED | Private company limited by shares | Live |
| BYSEAN LIMITED | Private company limited by shares | Live |
| BYSEL LIMITED | Private company limited by shares | Dissolved |
| BYSELLER LIMITED | Private company limited by shares | Dissolved |
| BYSENDA TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Bysenl Limited | | Live |
| CRM BYSH LIMITED | Private company limited by shares | Live |
| Byshi Limited | Private company limited by shares | Live |
| BYSHUN CO., LIMITED | Private company limited by shares | Live |
| BYSION TECHNOLOGY LIMITED | | Live |
| BYSIT TRADING (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| BYSKY LIMITED | Private company limited by shares | Live |
| BYSMIQUE COMPANY LIMITED | Private company limited by shares | Dissolved |
| BYSO INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| Bysoft Asia Limited | Private company limited by shares | Live |
| BYSolar Asia Limited | Private company limited by shares | Live |
| Bysomood Limited | Private company limited by shares | Live |
| BYSSO INVESTMENT COMPANY LIMITED | Private company limited by shares | Live |
| England Bysson Group Company Limited | | Live |
| BYSTANDER HONG KONG LIMITED | Private company limited by shares | Dissolved |
| BYSTANDER INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| BYSTAR LIMITED | Private company limited by shares | Dissolved |
| Byster International Trading Co., Limited | | Live |
| BYSTRO INTERNATIONAL LIMITED | Private company limited by shares | Live |
| BYSZ CREATIVE COMPANY LIMITED | Private company limited by shares | Live |